Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2012	Apr. 02, 2012	Mar. 31, 2010	Mar. 31, 2012 Unsecured senior notes due 2014 [Member]	Mar. 31, 2012 Unsecured senior notes due 2019 [Member]	Mar. 31, 2012 Unsecured senior notes due 2021 [Member]	Mar. 31, 2012 Marine [Member]	Mar. 31, 2012 Marine [Member] U.S. Government guaranteed long-term financing - interest payable semiannually at 6.45%, due in semiannual installments through June 2027 [Member]	Mar. 31, 2012 Revolving Credit Facility [Member]	Feb. 07, 2012 Revolving Credit Facility [Member] Complete Merger [Member]	Feb. 07, 2012 March 31, 2012 Credit Facility Term Loan [Member]	Jun. 30, 2012 March 31, 2012 Credit Facility Term Loan [Member] Complete Merger [Member]	Feb. 07, 2012 March 31, 2012 Credit Facility Term Loan [Member] Complete Merger [Member]
Line of credit facility (Textual) [Abstract]
Line of credit facility maximum borrowing capacity before amendment										$ 400.0
Line of credit facility maximum borrowing capacity after amendment										600.0
Aggregate principal amount of term loan													400.0
Repayment installment of term loan												5.0
Line of credit facility amendments cost										24.5
Line of credit letters of credit outstanding									35.8
Maturity date of additional bank revolving credit facility											Feb. 07, 2017
Debt (Textual) [Abstract]
Debt Maturity Date				Jun. 01, 2014	May 01, 2019	Dec. 15, 2021
Stated interest rate on unsecured senior notes				6.875%	6.375%	7.125%
Debt instrument, outstanding				300	500	800
Outstanding guaranteed long-term financing							12.5	12.5
Make whole premiums associated with early extinguishment of disposal group debt							4.0
Wrote off amount of unamortized loans costs.	0.7						0.7
Debt (Additional Textual) [Abstract]
Interest payments at a fixed rate			6.875%
Notional amount of interest rate swap		100	150
Revolving credit facility, Outstanding	$ 0